Mx8000 power supply problems

The solution to power supply problem is simple. The five voltage regulators will fail. They consist of the following.
1-ml7812a from radio shack rs276-1771
3-lm350t from national semiconductor. The are aboout .90 each + shipping.
1 tl783c from texas instruments
they sent me one for free.

The only one that was bad in my power supply was the one for the +18vdc output. I changed all them anyway, I am sure another would have failed too. they are the only part that is bolted to the heat sink when open the top of the cabnet. The other parts seem to be bullit proof. instead of trying to de-solder the old regulators, I cut them out leaving plenty of leg length. Un-bolted the old ones in the exact same spot re-bolted the new ones with heat sink cream, and soldered thr new legs to the old ones. Make sure that you don't over heat them or they will be cashed right away. Clip an aligator clip between the solder gun and the body of the new part on each leg as you connect it. this will prevent them from getting fryed!